Lining for crucibles.



NITED STATES PATENT FFICE.

WILLIAM A. MOADAMS, OF NEW YORK, N. Y.

LINING FOR CRUCIBLES.

SPECIFICATION forming part of Letters Patent No. 665,254, dated January 1, 1901.

Application filed May 23, 1899- Serial No. 717,877.. (No specimens.)

T0 at wh0m, it may concern:

Be it known that I, WILLIAM A. MCADAMS, a citizen of the United States, and a resident of the borough of Brooklyn, in the city and State of New York, have invented a new and useful Improvement in Linings for Orucibles, of which the following is a specification.

My invention relates to an improvement in linings for crucibles or melting-pots for melting aluminium alloys containing aluminium, zinc, and copper.

Difficulty has arisen in providing a crucible for melting an alloy of the nature above indicated for the reason that it is essential in order to produce the best results that the lining of the crucible should not be of a nature which will admit of giving up silicon to the aluminium, as this materially injures the aluminium, and, furthermore, it should not be of such a nature that it will alloy with the zinc or aluminium, as is the case with an iron crucible or melting-pot, which is rendered useless by such alloys making a hole through it.

My present invention contemplates a lining which the alloy will not attack and which will not give up silicon to the aluminium and which at the same time may be readily applied to the interior surface of the crucible formed of various substances now in common use, producing a comparatively smooth surface to the molten metal and capable of being heated to adegree amplysufficient for the melting of the aluminium alloy without itself becoming fused.

My invention further contemplates the pro duction of a lining of the above character which shall be sufficiently inexpensive to render its use practicable in the art of producing pigs of the alloy for general commercial use.

With these ends in View my invention consists of a lining for crucibles for melting alloys in which aluminium, zinc, and copper are introduced composed of oxid of copper and the oxid of manganese.

I prefer to form the lining of oxid of mangan'ese and oxid of copper combined in the proportions of copper oxid, one part, and oxid of manganese, four parts.

I use the mixture practically by wetting it up in water to a paste and plastering it on the inner wall of the crucible to such a depth as may be preferred-for example, from an eighth to a quarter of an inch in thickness. Before, however, using the oxid of manganese for this purpose I fuse the oxid of manganese by submitting it to a temperature of 2,000 centigrade and upward and subsequently reduce the fused oxid of manganese to a powder. The crucible or melting-pot may be either of iron or of earthenware, such as are commonly found on the market. The

lining having been plastered in position, the

crucible, with its lining thereon, is dried and then submitted to a baking process, the oven in which it is baked being kept for an hour or less at a temperature of from 900 to 1,200 centigrade. This will partially fuse the oxid of copper, which will form a binder between the particles of manganese, presentinga hard, smooth inner face for the reception of the alloy containing aluminium, zinc, and copper to be subsequently melted therein.

What I claim is 1. A crucible-lining composed of oxid of manganese and oxid of copper, substantially as set forth.

2. A crucible-lining composed of the powdered fused oxid of manganese and the oxid of copper as a binder, substantially as set forth} In testimony that I claim the foregoing as my invention I have signed my name, in presence of two witnesses, this 19th day of May,

WILLIAM A. MOADAMS. Witnesses:

FREDK. HAYNES, C. S. SUNDGREN. 

